How to fix a BIGGER hole in a cast iron pipe?!

I have a hole in a pipe that needs to be fixed asap. It's about the size of a nickel. The pipe is under the kitchen sink and the hole is on the inside of the bend on an elbow piece. I would just replace the pipe but the other end goes straight through the back of the cabinet and disappears into the wall. No $$$ for a plumber right now, finances are thin due to holidays so it's not an option. If anybody has any ideas i'd appreciate it. Thanks.

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How to fix a BIGGER hole in a cast iron pipe?!

Most likely, right inside that wall is a tee. The pipe is probably galvanized steel since you said it has a hole in it. All around that hole is thin metal waiting to break through and make the hole bigger. Anything you do as far as a repair will be temporary and you may even crush the pipe if you uae clamps. Try getting a look just inside the wall. If the tee is there, it should not be a hard job to unscrew the pipe and replace it. You could even go with a PVC adapter and change to plastic instead of metal.

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How to fix a BIGGER hole in a cast iron pipe?!

If it's cast iron the I would cut it on either side of the elbow and replace the bad section with rubber. You can get a rubber piece in advance from a hardware store and then use it as a guide for how much to cut. It's not to had to cut cast iron with a sawzall. Just takes time. The rubber will then slip over the iron and clamp tight.

Going to the T can cause a problem as they are often times put together with lead type packing and not so easy to replace.